/*-
 * ========================LICENSE_START=================================
 * flyway-core
 * ========================================================================
 * Copyright (C) 2010 - 2025 Red Gate Software Ltd
 * ========================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =========================LICENSE_END==================================
 */
package org.flywaydb.core.internal.configuration.resolvers;

import org.flywaydb.core.ProgressLogger;
import org.flywaydb.core.api.FlywayException;

public class EnvironmentVariableResolver implements PropertyResolver {
    @Override
    public String getName() {
        return "env";
    }

    @Override
    public String resolve(String key, PropertyResolverContext context, ProgressLogger progress) {
        String result = System.getenv(key);
        if (result == null) {
            throw new FlywayException("Unable to resolve environment variable: '" + key + "'");
        }
        return result;
    }

    @Override
    public Class getConfigClass() {
        return null;
    }
}
